Ecumenical Patriarch Basileios III

Ecumenical Patriarch Basileios III (1232-) was the Ecumenical Patriarch of Constantinople from 1263, succeeding Ecumenical Patriarch Arsenios.

Biography
Basileios was born in 1232 as "Markos" to the House of Autoreianos, a dynasty of Orthodox Christian Greeks. Markos was elected as the new Ecumenical Patriarch of Constantinople in 1263 following the death of Ecumenical Patriarch Arsenios, and he resided in Constantinople as the religious head of Emperor Michael VIII of Byzantium.